Sewing-machine tension



(No Model.)

J. B. SEGOR.

SEWING MACHINE TENSION. I No. 286,336. Patented Oct. 9, 18 83 UNITED STATES PATIENT OFFICE.

JEROME B. SECOR, OF BRIDGEPORT, CONNECTICUT.

SEWING-MACHINE TENSION.

srncrrron'rron forming part of Letters Patent 1%. 286,336, dated October 9, 1883.

Application filed January 24,1883. (No model.)

B. Sncon, of

tion, of the sewing-machine constituting the subject-matter of a separate application below referred to, and illustrating-my tension device. Fig. 2 is an enlarged section on the line 1 2, Fig. 1; and Fig. 3 is a plan of the parts shown in Fig.2. I

The frame A of the machine may be of any suitable form, and carries a needle-bar, G, suitably guided, a shaft, 0, from which such bar derives its motion, awork-plate, a, .and any suitable thread looking or looping appliances below the latter- Asshown, the parts described correspond to those in the machine, which is the subjectmatter of the aplication filed by me October 5, 1882, Serial No. 73,463.

A spring-plate, M, has its bearing upon a face, as, of the frame A, adjacent to one of the bearings of the shaft 0, and the latter carries a cam, q, so set and constructed as to lift the plate M away from the face 00 at the moment when the thread must be drawn from the spool S to make the usual loop below the workplate. The plate M is guided by a pin, 1', ex-

tending from the frame Othrough a hole in the plate, and also serving as a guide to-direct the thread from the spool to a slot, w, in

the plate through which it passes beneath the 4o plate, between the latter and the face as, to the needle through suitable guides. The cam q is constructed to hold npthe plate and permit the thread to pass freely without friction, so

long as the loop is being drawn or spread below the work-plate, and then to allow the plate M to descend and clamp the thread, so as to maintain the requisite tension during succeeding operations. I

I do not claim a spring tension-plate, a shaft provided with a cam-disk, and a pendent arm between the spring-plate and cam-disk through which the disk will raise the spring-plate; but

What I claim is- I In a sewing-machine, the combination of a vibrating needle-bar, a shaft supported on the upper part of the machine-frame, and provided with a crank to operate the needle-bar, a spring tension-plate arranged to bear on a face above the crank-shaft, a cam on the crankshaft adapted to bear directly against the tension-plate to lift said plate as the loop is spread beneath the work plate, and guides whereby the needle-thread is conducted between said spring-plate and face, substantially as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

.JEROME B. SEGOR.

Witnesses:

ALFREDVB. BEERS, ISAAC O. FowLnR. 

